 body {
            margin: 0;
        }
        img{
            width: 100%;
            height: 100%;
        }
        .left{
            float: left;
        }
        .container{
            width: 1000px;
            margin: 0 auto;
        }
        .header {
            background-color: #333;
        }
        .header .menu {
            float: left;
            color: white;
        }

        .header .account {
            float: right;
            color: white;
        }
        .header a{
            color: #b0b0b0;
            line-height: 40px;
            display: inline-block;
            font-size: 12px;
            margin-right: 10px;
            text-decoration: none;
        }
        .header a:hover{
            color: white;
        }
        .sub-header .ht{
            height: 100px;
        }
        .sub-header{
            height: 100px;
        }
        .sub-header .logo{
            width: 234px;
            float: left;
        }
        .sub-header .logo a img{
            margin-top: 22px;
            display: inline-block
        }
        .sub-header .menu-list{
            float: left;
            line-height: 100px;
        }
        .sub-header .menu-list a{
            display: inline-block;
            padding: 0 20px;
            color: #333;
            font-size: 16px;
            text-decoration: none;
        }
        .sub-header .menu-list a:hover{
            color: #ff6700;
        }
        .sub-header .search{
            float: right;
        }
        .slider .sd-img{
            width: 1000px;
            height: 460px;
        }
        .news{
            margin-top :14px;
        }
        .news .channel{
            width: 230px;
            height: 170px;
            background-color: #5f5750;
            padding: 1px;
        }
        .news .channel .item{
            height: 86px;
            width: 76px;
            float: left;
            text-align: center;

        }
        .news .channel .item a{
            display: inline-block;
            font-size: 12px;
            padding-top: 18px;
            color: #fff;
            text-decoration: none;
            opacity: 0.7;
            /* 透明度设置  */
        }
        .news .channel .item a:hover{
            opacity: 1;
        }
        .news .channel .item img{
             height: 24px;
             width: 24px;
             display: block;
             margin: 0 auto 4px;
        }

        .news .list-item{
            width: 250px;
            height: 170px;
        }
        .back{
            position: fixed;
            width: 100px;
            height: 500px;
            border: 1px solid red;
            right: 0px;
            bottom: 100px;

        }
        .app{
            position: relative;
        }
        .app .download{
            position: absolute;
            height: 100px;
            width: 100px;
            display: none;
        }
        .app:hover .download{
            display: block;
        }